| 601 | SASTR | SAS TASIMACILIK VE TICCARET LTD.STI | | TR | VKM |
| 602 | SASU | SUNMAR CONTAINER LINES | | | SCAC1 |
| 603 | SASU | SUNMAR SHIPPING INC. | | | SCAC4 |
| 604 | SASX | Continental Tank Car Corp. | added 1/1979; 1/1980; eliminated 7/1982 | | NAKINA |
| 605 | SASX | Suburban Fuel Tank Car Co. | added 7/1965; 7/1965-1/1975; eliminated 1/1979 | | NAKINA |
| 606 | SASX | Olin Mathieson Chemical Corp. | added 10/1954; 10/1957-4/1961; eliminated 7/1965 | | NAKINA |
| 607 | SASX | Mathieson Chemical Corp. | 1/1950-7/1954; eliminated 10/1954 | | NAKINA |
| 608 | SASX | Southern Acid & Sulphur Co., Inc. | 7/1932-4/1947 | | NAKINA |
| 609 | SASX | Southern Acid & Sulphur Co. | 8/1920-7/1930 | | NAKINA |
| 610 | SASX | Southern Acid & Sulphur Co., Inc. | Apr-38 | | NRHS |
| 611 | SASX | Mathieson Chemical Corp. | Jan-52 | | NRHS |
| 612 | SASX | Olin Mathieson Chemical Corp. | 10/57-4/61; eliminated 7/65 | | NRHS |
| 613 | SASX | Suburban Fuel Tank Car Co. | added 7/65; 7/65-1/75; eliminated 1/79 | | NRHS |
| 614 | SASX | Continental Tank Car Corp. | added 1/79; 1/80; eliminated 7/82 | | NRHS |
| 615 | SASX | *SOUTHERN ACID & SULPHUR CO., INC. | | | PWRC |
| 616 | SASX | *OLIN MATHIESON CHEMICAL CORP. [MATHIESON CHEMICAL CORP.] | | | PWRC |
| 617 | SASX | *CONTINENTAL TANK CAR CORP. [SUBURBAN FUEL TANK CAR CO.] | | | PWRC |
| 618 | SASX | +KDL TRANSPORTATION, LLC d/b/a SA SERVICES, LLC | | | PWRC |
| 619 | SASX | KDL TRANSPORTATION LLC DBA SA SERVI | | | SCAC4 |
| 620 | SASY | S & S CHARTERS LLC | | | SCAC4 |
| 621 | SAT | SATA Air Acores | IATA: SP | | ICAO1 |
| 622 | SAT | Sendai Airport Railway System | | J | TRAFFIC |
| 623 | SATA | SATA: Servicio Autónomo de Transporte Aéreo | | YV | TRAFFIC |
| 624 | SATB | SANTINI EXPORT PACKAGING CORP | | | SCAC4 |
| 625 | SATC | SACRAMENTO AUTO TRUCK CO | | | SCAC1 |
| 626 | SATE | SATENA Servicio Aereo a Territorios Nacionales | Real: NSE | CO | TRAFFIC |
| 627 | SATED | SA Tramvie Elettriche Dogliani | | I | TRAFFIC |
| 628 | SATF | S A TRANSFRONTERIZOS | | | SCAC4 |
| 629 | SATG | SHARP TRUCKING CO INC | | | SCAC4 |
| 630 | SATH | SAFE ALL THE WAY TRANSPORTATION INC | | | SCAC4 |
| 631 | SATJ | SEA TREK II | | | SCAC4 |
| 632 | SATK | S A T TRUCKING INC | | | SCAC4 |
| 633 | SATL | SATTERLEE LEASING INC | | | SCAC4 |
| 634 | SATN | SAN ANTONIO TRUCKING SA DE CV | | | SCAC4 |
| 635 | SATO | SAFE TRANSPORT INC | | | SCAC4 |
| 636 | SATP | ST AUGUSTINE TRANSPORT LTD INC | | | SCAC4 |
| 637 | SATP | SATA Air Açores | Real: SAT | P | TRAFFIC |
| 638 | SATQ | STATEWIDE AUTO TRANSPORT INC | | | SCAC4 |
| 639 | SATS | SOUTH ATLANTIC STEAMSHIP CO. | | | PWRC |
| 640 | SATS | SOUTHERN AUTO TRANSPORT SERVICES IN | | | SCAC4 |
| 641 | SATTI | Societá per Azioni Transporti Torinesi Intercommunali | | I | TRAFFIC |
| 642 | SATU | DSV SPA | | I | BIC |
| 643 | SATU | SAIMA AVANDERO SPA | | | SCAC4 |
| 644 | SATV | SACKETT ENTERPRISE INC OF STEVENSVI | | | SCAC4 |
| 645 | SATV | TUDELA VEGUIN, S.A. | | ES | VKM |
| 646 | SATW | SURF AUTO TRANSPORT LLC | | | SCAC4 |
| 647 | SATX | City Public Service of San Antonio, Texas | added 4/2001; eliminated 4/2003; 7/2005 (not listed) | | NAKINA |
| 648 | SATX | City Public Service Board of San Antonio, Texas | added 10/1976; 1/1980-7/2000; eliminated 4/2001 | | NAKINA |
| 649 | SATX | Mathieson Chemical Corp. | 1/1950 (not listed) | | NAKINA |
| 650 | SATX | Standard Wholesale Phosphate & Acid Works, Inc. | 7/1937-4/1947 | | NAKINA |
| 651 | SATX | Standard Acid Works, Inc. (Standard Wholesale Phosphate & Acid Works, Inc.) | 7/1930-7/1932 | | NAKINA |
| 652 | SATX | Standard Acid Works, Inc. | 8/1920 | | NAKINA |
| 653 | SATX | Standard Acid Works, Inc. (Standard Wholesale Phosphate & Acid Works, Inc.) | Apr-38 | | NRHS |
| 654 | SATX | City Public Service Board of San Antonio, Texas | 1/80-7/2000; eliminated 4/2001 | | NRHS |
| 655 | SATX | City Public Service of San Antonio, Texas | added 4/2001 | | NRHS |
| 656 | SATX | *MATHIESON CHEMICAL CORP. [STANDARD WHOLESALE PHOSPHATE & ACID WORKS, INC.; STANDARD ACID WORKS, INC.] | | | PWRC |
| 657 | SATX | +CITY PUBLIC SERVICE BOARD OF SAN ANTONIO TEXAS | | | PWRC |
| 658 | SATX | City Public Service Board of San Antonio, Texas | | | RSRV |
| 659 | SATX | CITY PUBLIC SERVICE BOARD OF SAN AN | | | SCAC4 |
| 660 | SATY | SATTERLUND TRUCKING | | | SCAC4 |
| 661 | SAU | United Aviation Services, S.A. | Callsign: Uniserve, | E | AVCODES |
| 662 | SAU | United Aviation Services | | | ICAO1 |
| 663 | SAUC | SECOND (2ND) CHANCE TRUCKING LTD | | | SCAC4 |
| 664 | SAUD | SAUDI NATIONAL LINES | | | PWRC |
| 665 | SAUD | SAUCEDA MOVING | | | SCAC4 |
| 666 | SAUJ | SAUNDERS TRUCKING INC | | | SCAC4 |
| 667 | SAUK | SADLER TRUCKING CO | | | SCAC4 |
| 668 | SAULT | Sault Saint Marie Transit | | CDN | TRAFFIC |
| 669 | SAUO | SCOTTIES AUTO TRANSPORT INC | | | SCAC4 |
| 670 | SAUP | SAUER EXPRESS INC | | | SCAC4 |
| 671 | SAUR | SAUERS, WARREN C CO INC | | | SCAC4 |
| 672 | SAUR | South Australian Railways | Real: SAR | AUS | TRAFFIC |
| 673 | SAURER | | | CH | TRAFFIC |
| 674 | SAUT | SAUDER TRANSPORT LTD | | | SCAC4 |
| 675 | SAUX | Sauvage Gas Co. | added 1/1965; 7/1965-7/2005 | | NAKINA |
| 676 | SAUX | Sauvage Gas Co. | added 1/65; 7/65-7/2000 | | NRHS |
| 677 | SAUX | SAUVAGE GAS CO. | | | PWRC |
| 678 | SAUX | Sauvage Gas | | | RSRV |
| 679 | SAUY | SAUDER, RANDY | | | SCAC4 |
| 680 | SAV | Sanair | Callsign: Sanair Line, Ceased operations | UA | AVCODES |
| 681 | SAV | Sunair Aviation Ltd. | IATA: ZU, Callsign: Sunair, IATA designator ZU recalled. | NZ | AVCODES |
| 682 | SAV | Sunair Aviation Ltd. | Callsign: Sunair, IATA designator ZU recalled. | NZ | AVCODES |
| 683 | SAV | Sun Air Limited Liability Company | Callsign: Sun Air, Subsidiary of Sun Group. | VN | AVCODES |
| 684 | SAV | Samal Air | | | ICAO1 |
| 685 | SAV | SACRAMENTO VALLEY RAILROAD | | | PWRC |
| 686 | SAV | SACRAMENTO VALLEY RAILROAD | | | SCAC4 |
| 687 | SAV | Sacramento Valley Railroad | | USA | TRAFFIC |
| 688 | SAVA | SMITH AVIATION | | | SCAC4 |
| 689 | SAVB | SUPERIOR TOMATO AVOCADO LTD | | | SCAC4 |
| 690 | SAVD | S A V ENTERPRISES INC | | | SCAC4 |
| 691 | SAVE | SOUTH AVENUE MOVING INC | | | SCAC4 |
| 692 | SAVG | SAVAGE SERVICES CORPORATION | | | SCAC4 |
| 693 | SAVI | SAV LOGISTICS INC | | | SCAC4 |
| 694 | SAVJ | SAVLO LOGISTICS INC | | | SCAC4 |
| 695 | SAVK | SAVAGE, P & SONS TRUCKING INC | | | SCAC4 |
| 696 | SAVM | SPORTSMANS AIR SERVICE | | | SCAC4 |
| 697 | SAVN | SAVE TRANSPORTATION SERVICE | | | SCAC4 |
| 698 | SAVO | SAV ON MOVING & STORAGE | | | SCAC4 |
| 699 | SAVQ | SEALAND AVIATION LTD | | | SCAC4 |
| 700 | SAVT | S A V EXPRESS INC | | | SCAC4 |
